Relative atomic mass: 87.62 +- 0.01

English: Strontium
French: Strontium
Croatian: Stroncij
German: Strontium
Italian: Stronzio
Spanish: Estroncio

Atomic number: 38
Group numbers: 2
Period: 5
Standard state (20 oC): solid

Discovery: 1789 Adair Crawford (GB)
Strontium was discovered by Adair Crawford (GB) in 1789. Named after the village of Strontian in Scotland. It is a soft, malleable, silvery-yellow metal that is combustible in air and reacts with water. Exposed surfaces form protective oxide film. It ignites and burns readily. Strontium is found in minerals celestite and strontianite. Strontium is used in flares and fireworks for crimson colour. Strontium-90 is a long lived highly radioactive fallout product of atomic-bomb explosions. The price of 99 % pure strontium ingot is 322.30 for 1000 g.
Electronic configuration: [Kr] 5s2
Formal oxidation number: +2
Atomic radius: 215.1 pm

Electronegativities: 0.95
Thermal conductivity: 49 W/(m K)
Electrical resistivity (20 oC): 23 microOhm cm

Melting point: 777 oC
Boiling point: 1382 oC

Heat of fusion: 9.16 kJ/mol
Heat of vaporization: 154.4 kJ/mol
Heat of atomization: 164.4 kJ/mol

37Rb <= 38Sr => 39Y

ASCII Periodic Table of the Elements
6 Jan. 2020
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